Check out Handsontable or Ag-grid. This is a market you can address and sell immediately too. Lots of us are keen to build internal tools that do spreadsheet in

Check out Handsontable or Ag-grid. This is a market you can address and sell immediately too. Lots of us are keen to build internal tools that do spreadsheet in the front end and server on the back end. If you can build a turnkey aoliti2for the web (with an API), that's easily monetizable.